88.1 Prescriptions that Apply
The prescriptions that apply to an event are the prescriptions of the national
authority with which the organizing authority is associated under rule 89.1.
However, if boats will pass through the waters of more than one national authority
while racing, the notice of race or sailing instructions shall identify the
prescriptions that will apply and when they will apply.

88.2 Changes to Prescriptions
The notice of race or sailing instructions may change a prescription. However,
a national authority may restrict changes to its prescriptions with a prescription
to this rule, provided World Sailing approves its application to do so. The
restricted prescriptions shall not be changed.